3 dB SMA Cryogenic Fixed Attenuator DC–18 GHz 50 Ω
P/N: VST-QU-SMA030202-18G
- For light attenuation in cryogenic RF paths
- Compact inline format for low-temperature microwave chains
- Stable 50 ohm matching for signal conditioning
- Well suited to dilution refrigerator and quantum platforms
- Non-magnetic option for sensitive environments
Engineering Note
The VST-QU-SMA030202-18G is an inline SMA cryogenic fixed attenuator designed for controlled signal reduction in low-temperature RF and microwave paths. With 3 dB nominal attenuation, 2 W power handling, and DC–18 GHz frequency coverage, it provides a compact 50 Ω attenuation solution for cryogenic RF systems, dilution refrigerator signal chains, quantum computing platforms, and other low-temperature microwave measurement setups where stable signal conditioning is required.
Technical Specifications
| Part Number | VST-QU-SMA030202-18G |
|---|---|
| Product Type | SMA Cryogenic Fixed Attenuator |
| Connector Interface | SMA-JK |
| Frequency Range | DC–18 GHz |
| Nominal Attenuation | 3 dB |
| Attenuation Tolerance | ±0.3 dB |
| VSWR Max | 1.35 : 1 |
| Impedance | 50 Ω |
| Power Rating | 2 W |
| Structure | Inline SMA cryogenic fixed attenuator |
| Body Material | Brass, gold-plated |
| Male Inner Contact | Beryllium copper, gold-plated |
| Female Inner Contact | Beryllium copper, gold-plated |
| Body Length | 22 ± 1 mm |
| Across Flats | 5/16 HEX |
| Configuration | Non-magnetic option available |
| Compliance | RoHS |
Target Applications
Cryogenic RF Systems
Suitable for light signal reduction in low-temperature RF paths where compact in-line attenuation and stable 50 Ω matching are required.
Quantum Computing Platforms
Designed for quantum-related microwave chains and measurement platforms where cryogenic compatibility and optional non-magnetic configuration are important.
Dilution Refrigerator Signal Chains
Well suited to controlled attenuation and RF path matching in dilution refrigerator systems and other low-temperature microwave measurement setups.
Engineering Support
Need a Quote or Technical Support?
Share the part number, required quantity and application requirements. Our engineering team can assist with product selection, configuration review and quotation support.
Product selection support
Custom configurations available
Specification and compatibility review






